In GIMP when using Airbrush with different brushes I can get different brush form and smoothness, look at pictures:






But in Krita I can't get same smoothness on intersection with mixing different strokes of Pixel brush. I tried to do something with predefined brushes or gaussian brush/soft brush, it pointless.
Every result looks somethins like this



So I want to ask any tips, hints how to make strokes with real smoothness from center to border of stroke like on 1st picture.